Solidity · Beginner
How to learn Solidity in 2026: a practical path from zero to deployed contract
A no-fluff roadmap for learning Solidity: the concepts in order, the mistakes to expect, the tools to use, and a first project you can deploy to Monad testnet this week.
Solidity is a small language with a large blast radius. The syntax takes a weekend; the judgement about what not to do takes longer. This path front-loads the judgement.
Week 1: the mental model
- Understand what a transaction is, what gas is, and why storage writes are expensive.
- Learn the difference between
storage,memory, andcalldata. - Write a contract with one mapping, one function that writes it, one event. Compile it in a browser IDE. Deploy it to a testnet. Call it. Read the event on the explorer.
Do this in a browser, not a local toolchain. Setup friction is the number one reason people stop on day one. Monsmith and Remix both compile in the tab.
Week 2: the standard building blocks
- Modifiers and access control (
onlyOwner). - Inheritance and interfaces.
- OpenZeppelin: read the ERC-20 source top to bottom. It is short and it is what everyone uses.
- Build your own token by inheriting ERC-20. Add a mint function guarded by ownership. Deploy it.
Week 3: how contracts get hacked
Before you write anything that holds value, study the failure modes: reentrancy, missing access control, unchecked external calls, integer assumptions, front-running, oracle manipulation. Rewrite a vulnerable contract to be safe. Run it through an automated audit and see what it catches and what it misses.
Week 4: a real project
Pick something with two or three contracts that talk to each other: an NFT with a marketplace, a staking pool, an escrow. Write tests. Deploy to Monad testnet. Get a friend to try to break it.
Tools, in the order you will need them
| Stage | Tool | Why |
|---|---|---|
| Day 1 | Monsmith or Remix | Zero setup, compile and deploy in the browser |
| Week 2 | OpenZeppelin | Audited building blocks |
| Week 3 | Monsmith audit | Automated first-pass security review |
| Week 4 | Hardhat or Foundry | Local tests, scripts, CI |
| Ongoing | Chain Fit | Know what your contract costs on each chain |
Habits that separate good Solidity developers
- Checks, effects, interactions, in that order, every function.
- Custom errors over revert strings; events for every state change.
- Smallest possible privilege for every function.
- Measure gas rather than guess. Measure storage contention if you deploy to a parallel chain.
Frequently asked questions
- How long does it take to learn Solidity?
- The syntax takes about a week for someone who already programs. Being trusted with a contract that holds real value takes months of studying exploits and writing tests.
- Do I need to know JavaScript to learn Solidity?
- Not to write contracts. You will want JavaScript or TypeScript later for tests, scripts, and front-ends.
- Where can I write Solidity without installing anything?
- In a browser IDE. Monsmith (monsmith.com/studio) compiles, audits, profiles, and deploys to Monad in the browser with no account required.
Try it in Monsmith
Free, in the browser, no account. Compile, audit, profile, and deploy to Monad.
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